Question

what comes next in the series?
79,87,__,89,83,91

Answer 1

Hey guys this is your solution
*It should be 81

Answer 2

Concept

Look for the pattern between consecutive numbers and see if there is any consistent pattern in the whole series.

Given

The series 79, 87, __, 89, 83, 91.

Find

The missing number in the series.

Solution

Subtract 1st number from the 2nd number

87 - 79 = 8.

Subtract 4th number from the fifth number,

83 - 89 = -6.

Subtract the 5th number from the 6th number,

91 - 83 = 8.

We see 8 and -6 are successively added to 79 to obtain other numbers in the series.

Add 8 to 79 to get 87.

Add -6 to 87 to get 81.

Add 8 to 81 to get 89.

Add -6 to 89 to get 83.

And finally add 8 to 83 to get 91.

The missing number is, thus, 81.

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